A review of the "Migrate File Entities to Media Entities" module in Drupal 9:
- spinning up a vanilla D9 site with content moderation and workflows,
- generating nodes and images using Devel Generate,
- and migrating images from image fields into media entities.
Also a quick review of the "Audit Files" module, used to identify issues with Drupal's file management: differences between files and the management database tables (orphaned files), differences between managed files and usage, etc.